Google developed a computer interface system based on hand/motion sensing radar operating in the 60 GHz band. Facebook have concerns that the use of such devices might cause interference to wideband data transmission systems operating in the same band (e.g. Wi-Gig). Plum were commissioned to review the technical studies on the issue, and draft a[…]
For the Australian Department of Communications and the Arts, Plum analysed technical conditions influencing spectrum sharing in the 26 GHz band between satellite services and mobile broadband including review of inputs into the WRC-19 process. Plum undertook a review of key sharing constraints proposed by the satellite operator and associated parameters, and assessed proposed technical[…]
Richard Rudd was the lead author for a paper on the development of the new ITU-R model for building entry loss. This paper describes the derivation and form of the new model and highlights work that remains to be done in this area. The ITU-R has recently published a new recommendation giving a method for[…]
Richard Rudd was the lead author for a paper on measuring clutter loss and building entry loss. The paper found that models and measurements exist for building entry loss and for loss due to local clutter. However, there appears to be less information on the combined effects of the two mechanisms. The paper reports on[…]
Richard Rudd, along with Maziar Nekovee of the University of Sussex, authored a paper on the propagation of millimetre-wave frequencies in urban clutter. The paper describes path loss measurements carried out at 27 GHz in London and Brighton. The primary purpose of the measurement campaign was to provide empirical support for the development of clutter[…]
Plum Consulting provided support to ComReg on their proposed release of the 410-415.5 / 420-425.5 MHz sub band. In particular Plum considered the potential uses of the spectrum including further spectrum for PMR, PPDR, smart metering, IoT networks and smart grids. The study considered spectrum requirements for the different services and availability of other frequencies.[…]
Despite continuing growth in mobile network coverage, there are many areas where enterprise users suffer from no, or poor, connectivity. Manufacturing, agricultural and transport industries in these regions suffer from their remote locations, and they often find that their ability to benefit from Industry 4.0 – the automation through connected machines – is limited. This[…]
This study for the Office of the Communications Authority (OFCA) provided an independent assessment of the impacts on service quality arising from reassignment of 900 MHz and 1800 MHz spectrum in Hong Kong. The assessment model developed by Plum analysed the network infrastructure requirements of mobile network operators under various market, technology evolution and spectrum[…]
Plum have recently collaborated with Huawei in undertaking a number of studies intended to clarify options for spectrum sharing in C-band. The report linked here addresses issues relating to the co-existence of LTE services and satellite downlinks in the same, or adjacent, spectrum. The report describes realistic field trials which illustrate the potential for geographical[…]
Plum has provided expert technical support to ComReg in relation to the future licensing and use of the 3.6 GHz band (3400 – 3800 MHz) in Ireland, following the expiry of existing rights of use for fixed wireless access local area (FWALA) licences in 2017. This included advising on the appropriate technical and other conditions[…]